9310 steel vs carpenter 158

THIS ITEM IS BACKORDEREDEstimated Ship Date From Time of Order: Up to 10 weeks Read our E-BCG White Paper HERE. LANTAC E-BCG®, Enhanced Bolt Carrier Group.M16 Full Auto Style for increased mass and lock time.Our new BCG is precision machined from 8620 Steel with a shot peened bolt manufactured from Carpenter 158 or 9310 and Magnetically Particle Inspected.The entire carrier assembly is NiB ...

I've seen 9310 used in some bolts and wonder if it's actually inferior. Is there technical data to show that c-158 is superior? Carpenter 158 Vs. 9310 - Page 150. C158, 8620, 9310 BCG Steel. These are the (3) most common BCG steels being used in today's AR/M4 industry (from what I read about). I know just a little bit about metallurgy, but, not enough to distinguish what comes into play when each steel is used for BCG's. My (2) AR's use 9310 steel for the BCG's.9310 VAR AMS 6265 is a Chromium-Nickel-Molybdenum Alloy used as a Carburizing Grade for Aircraft Parts. Users can obtain high case hardness coupled with high core strength and toughness. High alloy content makes it suitable for use in relatively large cross-sections. Its combination of high alloy and low carbon content can achieve high core ...Good for Indiana, bad for Michigan. There will be winners and losers from Donald Trump’s recently announced tariffs on steel and aluminum imports. A disproportionately large number...4-5 week lead time. FULL AUTO RATED Material: Case Hardened 8620 Steel Finish: NP3 Gas Key: 4140 Steel, a Cam Pin: Hardened 4140 cam pin Firing Pin: 17-4 Stainless Steel Bolt Assembly: Machined from case hardened 9310 steel then shot-peened, heat treated & 100% MPI tested per US Mil-Spec *Properly heat treated 9310 steel is on average 8% stronger than Mil-Spec standard Carpenter 158 steel ...LANTAC E-BCG®, Enhanced Bolt Carrier Group with TiN coating. M16 Full Auto Style for increased mass and lock time. Our new TiN E-BCG is precision machined from 8620 Steel with a shot peened bolt manufactured from Carpenter 158 or 9310 and Magnetically Particle Inspected. The entire carrier assembly is TiN, Titanium Nitride coated.The carrier is usually made of 8620 steel, but the bolt (which takes the brunt of pressure and such), I've seen made of 8620 steel, carpenter 158, and 9310 steel. The "mil-spec" is carpenter 158; some companies have claimed 9310 steel to be stronger or just as good, but less expensive. In stock at PSA right now are some quality BCG's for less ...SKU 51655115274 Brand Palmetto State Armory Model Number 51655115274 UPC 51655115274 DETAILS Manufacturer: Toolcraft Caliber: 5.56/.223 Bolt Finish: Nitride Bolt Steel: Carpenter No. 158 Steel Profile: Full Auto Profile Gas Key: Grade 8 Hardened Fasteners, Staked per MilSpec FEATURES This Toolcraft Logo'd Nitride BCG is made …

The bolt is CNC machined from heavy duty 9310 alloy steel. 9310 steel has a high core & fatigue strength rating, a high hardenability rating, and when properly treated it is actually about 7% stronger than the "mil-spec" Carpenter 158 steel. The bolt is shot peened (stress relieved) and finished with the same Nickel Boron finish as the carrier.Heat Treatment of steel grade SAE 9310 . Heat treated : 1657°C - 1767°C. Technological Curves of steel grade SAE 9310 . No Curve. Cross Reference Table (Equivalent Grade) of SAE 9310 . Grade Standard Country Application; SAE NVl(1541) SAE: USA: precipitation hardening: SAE NV2(1547) SAE: USA:Both normalized SAE-AISI 9310 and SAE-AISI 4340 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.Description CarTech No. 158 alloy is a chrome-nickel alloy steel with an analysis representing the best case hardening steel known for parts subject to heavy shock and wear. This alloy is ideally suited for jobs where an extra measure of core strength is required. Fully treated, CarTech No. 158 alloy attains a core strength of approximately …140-280. 1.20. Zr-0.0C1%Hf (Grade 21) Zircaloy 2 (Grade 32) Zircaloy 4 (Grade 34) Have a look at our machinability rating graph which without a doubt will make your decision a lot easier with its incredibly detailed information.SAVE TO FAVORITES. Premium quality chromium-nickel-molybdenum carburizing steel produced by the vacuum consumable electrode process. It has high hardenability, …

Can somebody tell me what the difference is between c-158 and 9310 and why 9310 isn't mil-spec? I've seen 9310 used in some bolts and wonder if it's actually inferior. Is there technical data to show that c-158 is superior?C158 minus proprietary source + molybdenum = 9310, a slightly stronger steel with lower quench rates to be come hard and less likely to become brittle than C158. C158 bolt breakages are the biggest failure point for the AR-15 bolt carrier group, and is the biggest reason why C158 is not widely used outside of the AR-15.Carpenter 158 9310 - MAY be harder than Carpenter 158 Nickel baron (easier to clean) Titanium BCG with an S7 bolt. Supposed to be three times more impact resistance than Carpenter 158 ... There has been an increase use in 9310 steel for bolts over C158. 9310 steel claims a slight advantage of toughness when properly heat treated which gives ...Carpenter 158® Nickel Alloys. Inconel® 718 AMS 5662 ... 9310 VAR AMS 6265 alloy steel from Rockwell is a low alloy carburizing steel known for its hardenability and ...The test gears used for this work were manufactured from AISI 9310 steel. The nominal chemical composition of the AISI 9310 material is given in Table 3. The gears were case carburized and heat treated according to Table 2 . The nominal properties of the carburized gears have a case hardness of Rockwell C60, a case depth of 0.038 in., and a ...

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Feb 11, 2017 · Can somebody tell me what the difference is between c-158 and 9310 and why 9310 isn't mil-spec? I've seen 9310 used in some bolts and wonder if it's actually inferior. Is there technical data to show that c-158 is superior?This premium backup bolt is a 9310 MPI spare bolt that perfectly fits the M16 and AR15 carriers and has a black nitride finish that provides increased corrosion resistance, natural lubrication and improved strength. When comparing 9310 vs 158 bolts, 9310 steel bolts provide a more reliable and durable base metal.Noveske's Enhanced 6mm ARC bolt info: Constructed from high-quality SAE 9310 steel sourced domestically, including complete traceability through Mill MTR's and heat treat certification. Materials and heat treat are meticulously controlled and verified. 9310 is a superior material to carpenter 158 for this use. DLC coated for exceptional ...The Carpenter 158 Bolt is heat treated, shot peened, precision ground for perfect dimensions, and MPI Tested. The 4140 Billet Gas Key is properly torqued with Grade 8 fasteners, and properly staked to ensure reliability. The 4140 Billet Cam Pin is nitride treated for wear resistance. ... 9310 Steel: Carrier Material: 8620 Steel: Country of ...

New Feature! Build a list of your favorite alloys. Click the heart icon on any alloy to being creating your account. GOT IT >. SAVE TO FAVORITES. A general purpose, air-hardening tool steel with high impact and shock resistance, and good resistance to softening at moderately high temperatures, an excellent general-purpose steel.Bolt Carriers made from 8620 Steel, 6A1-4V Titanium or Aluminum ... Bolts available in 9310 Steel or Carpenter 158; Lifetime Warranty. Our products carry a lifetime warranty. Simply put… Should any of our products fail, return it to us for a brand new replacement. Home; Products; Quality Requirements; Coatings;Carpenter 158® (CarTech® No.158®) is a chrome-nickel alloy steel best suited for parts subject to heavy shock and wear. Carpenter 158 supplied by Rockwell Industries is ideally suited for jobs where an extra core strength is required. Fully treated, Carpenter 158 attains a core strength of approximately 160 ksi (1103 MPa) tensile strength ...For a private individual, why would it be any different? You buy a C158 bolt and it lasts 10,000 rounds, so you replace it for $80.00 after 10,000 round.Carpenter ants can be a problem inside of a home as well as in trees or wooden structures outside of the home. Expert Advice On Improving Your Home Videos Latest View All Guides La...Carpenter 158® (CarTech® No.158®) is a chrome-nickel alloy steel best suited for parts subject to heavy shock and wear. Carpenter 158 supplied by Rockwell Industries is ideally suited for jobs where an extra core strength is required. Fully treated, Carpenter 158 attains a core strength of approximately 160 ksi (1103 MPa) tensile strength ...Lugs were a little more beefy, made from 9310 Vac Arc steel. Seemed to be a little more rugged looking than your standard mil. spec. bolt made from Carpenter 158. A few other minor differences. I have never installed or run this bolt before and was curious if anyone else has had any experience with bolts made from 9310 Vac Arc steel?Explore the pros, cons, and differences between vinyl, steel, and aluminum gutters for your home. Find the best fit for your needs and budget. Expert Advice On Improving Your Home ...Build a list of your favorite alloys. Click the heart icon on any alloy to being creating your account. Premium quality chromium-nickel-molybdenum carburizing steel produced by the vacuum consumable electrode process. It has high hardenability, high core hardness, and superior fatigue strength.

9310 9310 VAC-ARC steel is a premium quality, high-grade chromium-nickel-molybdenum carburizing steel known for its high hardenability, core hardness, and exceptional fatigue strength. Produced through a vacuum consumable electrode process, 9310 ensures exceptional performance for demanding applications. This alloy is widely

Though Carpenter 158 and 8620 steel are used for making Mil-Spec AR-15s, M4s, and M16s, many commercial manufacturers also use other materials. For instance, Faxon Firearms use 9310 Steel bolts for their BCG, and V Seven Weapon System offers a bolt carrier in Grade 5 Titanium. These materials are actually stronger than Mil-Spec steel and are ...On the hardenability of steel, 4140 heat treatment has good strength and good comprehensive mechanical properties, good manufacturability, high yield. The highest temperature is 427 degrees Celsius. 4140 strength, high hardenability, and good toughness, quenching deformation of small, high temperature creep rupture strength, and high.Carpenter 158 comes from one place, and one place only, Carpenter Technology of Reading PA. AISI 9310 steel can be sourced from any number of foundries, Carpenter being one of them. Needless to say, 9310 is more easily obtainable. Posted: 12/16/2016 12:41:00 AM EDT. [#5]There are a few key differences to note when comparing the two materials. Firstly, 8630 steel is a bit more expensive than 4140 due to its higher nickel content. However, it also has a higher strength-to-weight ratio than 4140, making it a great choice for applications where weight is a concern. Additionally, 8630 steel is more resistant to ...Fully treated, Carpenter 158 attains a core strength of approximately 160 ksi (1103 MPa) tensile strength with a yield point of approximately 135 ksi (931 MPa). These high mechanical properties are developed in sections up to 5" (127 mm) thick, making Carpenter 158 a consideration for use in very large parts requiring maximum strength, wear ...A286 AMS 5732 is an iron based superalloy designed for applications requiring high strength and good corrosion resistance at temperatures up to 1300°F (704 °C). A-286 AMS 5732 from Rockwell Industries attains its high strength levels through a solution heat treatment followed by a precipitation hardening. Its oxidation resistance remains high ...Target said: I read an article by Faxon ( manufacturer of barrels and other parts) and they claim that 9310 steel is better than Carpenter 158. C158 is MilSpec and at the time. a good steel. 9310 is newer and 7% better. Faxon has a good reputation for barrels. so I will take their word on this.Bolt Material: Machined from Mag Particle Inspected Carpenter 158 or 9310 Steel. Barrel: 16" M4 Profile, Chrome Lined with A2 Flash Suppressor. Barrel Material: 4150 Chrome Moly Vanadium 11595E Steel w. M4 Feed Ramps. Rifling: 1 Turn in 9" - Right Hand Twist.The test gears used for this work were manufactured from AISI 9310 steel. The nominal chemical composition of the AISI 9310 material is given in Table 3. The gears were case carburized and heat treated according to Table 2 . The nominal properties of the carburized gears have a case hardness of Rockwell C60, a case depth of 0.038 in., and a ...Material matters, and the Carpenter 158 steel of the standard Mil-spec bolt is suboptimal for such a high-load application leading to a life expectancy of only about 6,000 rounds. In fact, standard bolts will start to show stress cracks on the locking lugs adjacent to the extractor cut after only 3,000 rounds while cracking at the cam pin hole ...

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Quenched-and-tempered 9310 may be 7% stronger than Carpenter 158 (I really don't know, or care, the strength properties of either are not enviable), but nitrided 9310 is certainly not stronger than quenched-and-tempered Carpenter 158. That's silly. Carpenter 158 is AISI P6 mold steel, which is a standard tool steel grade. I don't know how old ...May 29, 2022 · Why 9310 Steel in an AR-15 / M16 Bolt? Why is 9310 Steel the superior option for your AR-15/M16 Bolt? Well, 9310 is actually around 7% stronger than Carpenter 158 and is better than "mil-spec." faxonfirearms.com. 9.Carpenter 158 9310 - MAY be harder than Carpenter 158 Nickel baron (easier to clean) Titanium BCG with an S7 bolt. Supposed to be three times more impact resistance than Carpenter 158 ... There has been an increase use in 9310 steel for bolts over C158. 9310 steel claims a slight advantage of toughness when properly heat treated which gives ...Quoted: As I understand it, Carpenter 158 is a case (surface) hardened steel where 8620 is through hardened. This would allow C-158 to be very hard on the outside to prevent wear and crack formation while the inside is softer and more flexible to prevent crack propagation and absorb shock loads. 8620 being through hardened can either be softer ...For starters, the bolt is made from 9310 steel which when properly heat treated is just about as durable as Mil-spec Carpenter 158 steel… In addition to that, the bolt is Magnetic Particle Inspected (MPI) which means that is inspected for weak points, and the carrier is constructed from 8620 which is an incredibly solid steel…9310 Steel bolt, M16-style bolt carrier group, MPI/HP tested; Gas key MIL-SPEC sealed, torqued and staked ... M16-style MIL-SPEC bolt carrier group and HPT/MPI-tested bolt made from Carpenter 158; Mid-length gas system with H buffer and pinned gas block ... this accuracy would start to suffer but given that the FN Guardian uses a fairly durable ...9310 is a premium quality alloy carburizing steel, containing nickel, chromium and molybdenum. It has a high hardenability, high core hardness and high fatigue strength, all of which make it ideally suited for critical aircraft engine gears, automotive applications, structural components, gears, rods, heat-treatable shafts, high performance helicopter transmission gears, and other components ...Bolt Steel Carpenter No 158 Steel Profile Full Auto Profile Gas Key Grade 8 Hardened Fasteners Staked per MilSpec Features This Toolcraft Logod Nitride BCG is made with a carpenter 158 bolt with a full auto profile designed to be used in AR 15 M 16 style rifles. AR 15 BOLT CARRIER GROUP BrownellsThe newer Carpenter AerMet alloy can achieve an ultimate tensile strength (UTS) of 2170 Mpa (315 ksi). It has a 2x7.5 km (1.10 mega-inch) strength-to-weight ratio (specific strength), which is higher than that of other alloys, including titanium, known for such high values. AerMet 310 alloy has a high figure of merit for toughness, compared ...For starters, the bolt is made from 9310 steel which when properly heat treated is just about as durable as Mil-spec Carpenter 158 steel… In addition to that, the bolt is Magnetic Particle Inspected (MPI) which means that is inspected for weak points, and the carrier is constructed from 8620 which is an incredibly solid steel…The most popular steel alloys for BCGs are Carpenter 158 and 9310 steel. The BCG encounters plenty of stress and heat, which makes steel an ideal material. 9310 steel is strong and durable, making it common among manufacturers. Carpenter 158 is more commonly used by the military. Heat Treatment9310 or Carpenter 158 (C158) Steel: Bolt Finish: Black Nitride: Caliber.223 | 5.56 NATO | 300 Blackout: Extractor O-ring: Viton; Mil Spec: Carrier Material: ... Cam Pin Finish: Black Nitride: Firing Pin Material: 8740 Steel; Hard Chrome Plated: Manufacturer: Toolcraft . Note: Some dealers are selling Toolcraft BCGs that have been finished after ... ….

Grade 6 titanium belongs to the titanium alloys classification, while SAE-AISI 9310 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown. For each property being compared, the top bar is grade 6 titanium and the bottom bar ...Though 9310 steel bolts are highly durable and strong, they may not be suitable for extremely high-temperature and corrosive environments. C158 Steel Bolt. C158 is a high-strength steel alloy that has excellent durability and toughness. These bolts are heat-treated and tempered for exceptional strength and performance in challenging environments.C-158 is simply Carpenters trade name for P-6 tool steel. P-6 and 9310 are very close in composition. The 9310 has some molybedenum while the P-6 has more chrome and nickel. 9310 is about half the cost of P-6. Which is better? Don't know, I barely made it through that class. IMO, the heat treat is probably more important than the alloy comp.Is it made from 9310 steel like the Maxim Arms bolt? I wonder what kind of pressure these can take. Everyone throws around the 53K figure for max Grendel presure but thats the max presure of a 5.56 bolt made from 158 carpenter steel not a Grendel bolt made from 9310 steel which has never been rated.Update: Some offers mentioned below are no longer available. View the current offers here.   My first trip to Austin, Texas, the land of breakfast tacos... Update: Some offers...Mar 11, 2022 · Toughness of over 200 ft./lb. Charpy C-Notch. HRC of 46 yields a 15% increase in hardness at the same toughness comparing to Carpenter 158 & 9310. Mil-Spec Extractor and Ejector Springs, Gas Rings. While the two bolts have identical construction, the two coatings vary slightly.Quoted: As I understand it, Carpenter 158 is a case (surface) hardened steel where 8620 is through hardened. This would allow C-158 to be very hard on the outside to prevent wear and crack formation while the inside is softer and more flexible to prevent crack propagation and absorb shock loads. 8620 being through hardened can either be …M-50 VIM-VAR is a premium-melted alloy exhibiting excellent resistance to multi-axial stresses, resistance to softening at high service temperatures and good resistance to oxidation. Characteristic of a high-speed tool steel, it possesses high compressive strength. All M-50 at Sullivan is melted in the USA. Domestic Source and DFARS Approved. FOR REQUIREMENTS: High Temperature Steel, Aircraft 9310 steel vs carpenter 158, May 12, 2016 · Carpenter Technologies' 158 blend of steel was selected as it provided adequate strength and wear characteristics. It has been the "Mil-Spec" since. Since the creation of Carpenter 158, the metals industry has continued to innovate, creating new blends of steels. 9310 is a AISI standard grade of tool steel that makes it about ~7% stronger than ..., In terms of properties, both 8620 and 4140 steel have excellent strength and wear resistance. However, what sets them apart is their hardness level and the amount of carbon they contain. 4140 steel is much harder than 8620 steel, making it a better choice for applications requiring high durability and resistance to wear and tear. On the other ..., Better Bolt metal 9310 Steel or Carpenter 158 AR15 COM. The market demands 4150 because it is believes to be so much better than 4140 when in actuality they are nearly identical C 158 is simply Carpenters trade name for P 6 tool steel P 6 and 9310 are very close in composition The 9310 has some molybedenum while the P 6 has more chrome and nickel, Grade 6 titanium belongs to the titanium alloys classification, while SAE-AISI 9310 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown. For each property being compared, the top bar is grade 6 titanium and the bottom bar ..., What Is the Difference Between 9310 Steel and Carpenter 158 Steel? 9310 steel and Carpenter 158 steel differ in their composition and intended applications. …, C-158 is simply Carpenters trade name for P-6 tool steel. P-6 and 9310 are very close in composition. The 9310 has some molybedenum while the P-6 has more chrome and nickel., Aug 28, 2016 ... The most common steel used in the bolt is Carpenter 158 steel. Some manufactures are using 9310 steel. Which is better? It depends who you ..., Carpenter 158 Vs. 9310. Printable View. Show 40 post(s) from this thread on one page. Page 15 of 15 First... 5 13 14 15. Jump to page: 04-30-17, 09:03. pinzgauer. Quote: Originally Posted by MegademiC. ... The Grendel fix was a combination of nuances in lug geometry along with the steel/treatment. And pretty much addressed Grendel bolt issues., C-158 is simply Carpenters trade name for P-6 tool steel. P-6 and 9310 are very close in composition. The 9310 has some molybedenum while the P-6 has more chrome and nickel., Build a list of your favorite alloys. Click the heart icon on any alloy to being creating your account. Premium quality chromium-nickel-molybdenum carburizing steel produced by the vacuum consumable electrode process. It has high hardenability, high core hardness, and superior fatigue strength., Carpenter 158 is just ANSI P6 steel. Perhaps look for a P6 supplier instead? ... IIRC, the original specifications for the GI issue model were for AQ-9310 (aircraft quality). The bolts were supposed to be good for 75K rounds, but most showed signs of cracking after 50-60K. I think that heat treat was changed to nitriding, but the numbers never ..., Mar 7, 2013 · Quoted: As I understand it, Carpenter 158 is a case (surface) hardened steel where 8620 is through hardened. This would allow C-158 to be very hard on the outside to prevent wear and crack formation while the inside is softer and more flexible to prevent crack propagation and absorb shock loads. 8620 being through hardened can either be softer ..., Carpenter 158 was originally developed as a dies steel and when carburized is best suited for application requiring high core strength and subjected to heavy shock and wear. Carburized 9310 is a very good steel when high core strength, toughness, fatigue, and wear properties are required. It's biggest use is in heavy duty gears and crankshafts., "Customers want modern designs, but the traditional stores do not offer that variety" The way Indians buy furniture seems to be changing. Until a few years ago, most would either c..., c158 is carpenter 158 meaning only carpenter can supply the stock so it's held to their standards. many years back after a mass shooting there was a run on parts including bcgs and manufacturers couldn't get c158 in a steady enough supply so they looked at alternative metals including 9310. on paper 9310 is stronger when heat treated correct, but given the rush of production that wasn't always ..., Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear., Both 8620 and 9310 steels belong to the same family - alloy steels. However, there is a difference in their chemical compositions. 8620 steel has a lower nickel, chromium, and molybdenum content, while 9310 steel has a higher percentage of these elements. This makes 9310 steel stronger and more heat resistant than 8620 steel., With a chrome lined, 8620 carpenter steel carrier, 9310 Super Alloy Steel bolt, and properly staked gas key, this full-shroud carrier group is perfect for you next .308 build. Brand - Anderson Manufacturing, Caliber - .308 Win, Carrier Style - M16 / Full-Auto, Platform - AR-308 - DPMS, Bolt Finish - Phosphate, Bolt Material - 9310 ..., 8620 Steel vs 9310. At first glance, it makes sense to compare these 2 steels. They're both low alloy steels with nickel and chromium. But the 9310 steel is much more reliably stronger, and with greater toughness as well. It offers greater tensile strength and yield strength. It's why it's used for components that require greater strength ..., Carpenter 158® (CarTech® No.158®) is a chrome-nickel alloy steel best suited for parts subject to heavy shock and wear. Carpenter 158 supplied by Rockwell Industries is ideally suited for jobs where an extra core strength is required. Fully treated, Carpenter 158 attains a core strength of approximately 160 ksi (1103 MPa) tensile strength ..., Carpenter 158 Vs. 9310. Printable View. Show 40 post(s) from this thread on one page ... Originally Posted by SilverBullet432. You could have a bolt machined from a unicorn's horn. It may be better then the no. 158 bolt, but, its not mil-spec. Thats not what the TDP calls for. ... Aermet 100 is one material that seems to be clearly better than ..., Better Bolt metal 9310 Steel or Carpenter 158 AR15 COM. The market demands 4150 because it is believes to be so much better than 4140 when in actuality they are nearly identical C 158 is simply Carpenters trade name for P 6 tool steel P 6 and 9310 are very close in composition The 9310 has some molybedenum while the P 6 has more chrome …, Technical Specs: • Gas system: Direct Impingement • Caliber: 5.56x45mm NATO/.223 Rem, .300 Blackout • Finish: Nickel Boron Coating • Bolt: 9310 Alloy Steel (High Hardness) or Mil-Spec Carpenter 158 • Carrier: 8620 Aircraft Grade Steel • Extractor: Shot Peened and Case Hardened D2 Tool Steel • Firing Pin: Mil-spec 8740 steel with ..., Typically the AR15 community looks for C-158 which is a blend of steel from Carpenter. 9310 is also a Carpenter product, but the make up of the steel differs between the two. What I surmised was that 9310 should be a better bolt material as long as it is properly heat-treated. It is less brittle than C-158 and theoretically stronger as long as ..., Jun 4, 2016 · semi_cop. I think 9310 has more molybdenum and C-158 and P-6 machine steel is the same and has more nickel and chrome. I think C-158 has to be bought in larger bulk quantities than 9310 which has also led to more 9310 offerings. From what I understand if done right 9310 is more durable. I think all my bolts are 9310 except one in a COLT 5.56 gun., Description CarTech No. 158 alloy is a chrome-nickel alloy steel with an analysis representing the best case hardening steel known for parts subject to heavy shock and wear. This alloy is ideally suited for jobs where an extra measure of core strength is required. Fully treated, CarTech No. 158 alloy attains a core strength of approximately 160 ..., I recently purchased a Toolcraft 5.56 NATO Black Nitride BCG....but choose 9310-Steel-Bolt instead of the Carpenter 158 steel bolt? Do I need to return it..., The Relia-Bolt™ is machined from S7 tool steel and tempered with SRC’s proprietary heat-treating process, significantly increasing strength when compared to MilSpec Carpenter 158. S7 provides a 75% increase in tensile strength, and nearly 60% improvement in yield strength.-See it at Sharps here. Low Plasticity Roller Ball Burnishing:, The NBS .223/5.56 Black Nitride Bolt Carrier Group was designed with strength in mind. Starting with a 9310 Steel Bolt, which is aircraft-grade material, this bolt has a high core strength rating, a high fatigue strength, and a high hardenability rating. 9310 steel, when treated properly, is about 7% better than Carpenter 158 steel, so you know that you will have a dependable BCG, when you ..., Jun 4, 2016 · semi_cop. I think 9310 has more molybdenum and C-158 and P-6 machine steel is the same and has more nickel and chrome. I think C-158 has to be bought in larger bulk quantities than 9310 which has also led to more 9310 offerings. From what I understand if done right 9310 is more durable. I think all my bolts are 9310 except one in a COLT 5.56 gun., Was: $149.99. — You save $70.00. Quantity: Add to Wish List. Description. Additional Information. Toolcraft BCG Nickel Boron AR15 / M16 Auto Bolt Carrier Group 9310 MPI Tested. All manufacturing and coating is done by Toolcraft. 100% Made in USA and includes Lifetime Warranty from Toolcraft., It also exhibits good strength, high toughness, hardenability, core strength, and very high fatigue strength. When annealed, 9310 has good ductility, machinability, and cold working properties. Additionally, 9310 is easily welded. It is typically used in gears, crankshafts, heavy-duty gears, the automotive, trucking, and aerospace industries., If fact, 9310 response to thin section quenching is better that Carpenter 158. And, taking the leap between this statement:". . . by comparison to Carpenter 158, AISI 9310 has several elements present in its composition that are detrimental to fatigue while not being evident in the physical properties . . ." and this statement: